Dobby device for controlling the motions of at least one weaving frame of a weaving machine, and a weaving machine provided with such a dobby device

Abstract

The invention relates to an electronic dobby device ( 100 ) for controlling the motions of at least one weaving frame of a weaving machine, wherein the at least one weaving frame is connected to two rotors ( 1,2 ) by means of a rod and lever system, wherein each rotor ( 1,2 ) is mounted on a rotor shaft ( 5,6 ) by means of an eccentric bearing, and wherein each rotor ( 1,2 ) is individually selected to be connected or not to the rotor shaft ( 5,6 ) by means of one or several selection elements in accordance with the weaving pattern to be woven, in order to move between two possible positions that can be taken up by the rotor ( 1,2 ) with respect to the rotor shaft when the rotor ( 1,2 ) is disconnected from the rotor shaft ( 5,6 ) by the selection elements, wherein the said two rotors ( 1,2 ) each are eccentrically journalled on a different rotor shaft ( 5,6 ) and both rotor shafts ( 5,6 ) are rotating continuously and for rotating over a complete rotation require the same period of time, and in that the said weaving frame can take up at least three different positions during each machine cycle to weave the required weaving pattern. On the other hand, the invention relates to a weaving machine provided with such a dobby device ( 100 ).

1. Electronic dobby device ( 100 ) for controlling the motions of at least one weaving frame of a weaving machine, wherein the at least one weaving frame is connected to two rotors ( 1 , 2 ) by means of a rod and lever system, wherein each rotor ( 1 , 2 ) is mounted on a rotor shaft ( 5 , 6 ) by means of an eccentric bearing, and wherein each rotor ( 1 , 2 ) is individually selected to be connected or not to the rotor shaft ( 5 , 6 ) by means of one or several selection elements in accordance with the weaving pattern to be woven, in order to move between two possible positions which may be taken up by the rotor ( 1 , 2 ) with respect to the rotor shaft when the rotor ( 1 , 2 ) is disconnected from the rotor shaft ( 5 , 6 ) by the selection elements, wherein the said two rotors ( 1 , 2 ) each are eccentrically journalled on a different rotor shaft ( 5 , 6 ) and both rotor shafts ( 5 , 6 ) are rotating continuously and for rotating over a complete rotation require the same period of time, and in that the said weaving frame can take up at least three different positions during each machine cycle to weave the required weaving pattern. 
   
   
     2. Electronic dobby device according to  claim 1 , wherein both said rotor shafts ( 5 , 6 ) are rotating in the same direction. 
   
   
     3. Electronic dobby device according to  claim 1 , wherein both said rotor shafts ( 5 , 6 ) are rotating in an opposite direction. 
   
   
     4. Electronic dobby device according to  claim 1 , wherein in order to attain a standstill to couple a rotor ( 1 , 2 ) to its respective rotor shaft ( 5 , 6 ), the rotating motion of both rotor shafts ( 5 , 6 ) is modulated, wherein this modulation is the same for both rotor shafts ( 5 , 6 ). 
   
   
     5. Electronic dobby device according to  claim 1 , wherein in order to attain a standstill to connect a rotor ( 1 , 2 ) to its respective rotor shaft ( 5 , 6 ), the rotating motion of both rotor shafts ( 5 , 6 ) is modulated, this modulation being different for both rotor shafts ( 5 , 6 ). 
   
   
     6. Electronic dobby device according to  claim 1 , wherein the weaving machine is provided with a main drive shaft, wherein both rotor shafts ( 5 , 6 ) are mechanically connected to this main driving shaft. 
   
   
     7. Electronic dobby device according to  claim 1 , wherein both rotor shafts ( 5 , 6 ) are driven by one and the same stepping motor or servomotor ( 7 ) with an intermediate driving mechanism with an input shaft that is connected to the output shaft of the stepping motor or servomotor and with two output shafts each of them connected to one of the two rotor shafts ( 5 , 6 ). 
   
   
     8. Electronic dobby device according to  claim 1 , wherein both rotor shafts ( 5 , 6 ) each are separately driven by a stepping motor or a servomotor ( 7 ). 
   
   
     9. Electronic dobby device according to  claim 7 , wherein a control is provided for coordinating the synchronization of the drive of the said rotor shafts ( 5 , 6 ) with the main drive shaft of the weaving machine. 
   
   
     10. Electronic dobby device according to  claim 7 , wherein the selection elements that select whether the rotors ( 1 , 2 ) are connected or not to the rotor shafts ( 5 , 6 ) are carried out as actuators realizing the connection and disconnection between the rotor and rotor shaft. 
   
   
     11. Electronic dobby device according to  claim 1 , wherein the extremities of each of both rotors ( 1 , 2 ) are connected to a first lever ( 8 , 9 ) that hinges around a shaft ( 10 ) with a fixed center axis and wherein the two first levers ( 8 , 9 ) are connected to a common second lever ( 11 ). 
   
   
     12. Electronic dobby device according to  claim 11 , wherein the first levers ( 8 , 9 ) are connected to the common second lever ( 11 ) by means of one or several rods ( 12 ). 
   
   
     13. Electronic dobby device according to  claim 11 , wherein the first levers ( 8 , 9 ) are directly connected to the common second lever ( 11 ), wherein one of the rotors ( 1 , 2 ) are connected to a fixed point ( 14 ) through a hinged arm ( 13 ). 
   
   
     14. Electronic dobby device according to  claim 11 , wherein the second lever ( 11 ) moves in accordance with a superposition of motions that are generated by the first rotor ( 1 ) on the first rotor shaft ( 5 ) and of motions generated by the second rotor ( 2 ) on the second rotor shaft ( 6 ) enabling the second lever ( 11 ) to reach four positions (I, II, II, IV). 
   
   
     15. Electronic dobby device according to  claim 11 , wherein the rod system formed by the said first and second levers ( 8 , 9 , 11 ) and the possible connecting rods ( 12 ) is provided in such a way that two of the four positions which may be taken up by the second lever coincide, in order to enable the weaving frames to be brought into three positions (I, II, III). 
   
   
     16. Electronic dobby device according to  claim 1 , wherein both rotors ( 1 , 2 ) are connected to one and the same first lever ( 8  or  9 ) which is connected to a second lever ( 11 ) by means of a connecting rod ( 12 ). 
   
   
     17. Electronic dobby device according to  claim 16 , wherein the second lever ( 11 ) at one extremity hingedly is connected to a shaft ( 10 ) with a fixed center, and in that the other extremity is connected to a lever and rod system realizing the connection with a weaving frame. 
   
   
     18. Electronic dobby device according to  claim 16 , wherein the couplings of the connecting rod to the first and second lever respectively ( 8 , 9 , 11 ) are adjustable, through which the positions taken up by the free extremity of the second lever ( 11 ) are adjusted with respect to one another. 
   
   
     19. Electronic dobby device according to  claim 1 , wherein both rotors ( 1 , 2 ) are installed in a same plane perpendicular to their respective rotor shafts ( 5 , 6 ). 
   
   
     20. Electronic dobby device according to  claim 11 , wherein the first levers ( 8 , 9 ) or the second lever ( 11 ) are connected to their respective rotors by means of a single-sided connection. 
   
   
     21. Electronic dobby device according to  claim 11 , wherein the first levers ( 8 , 9 ) or the second lever ( 11 ) are connected to their respective rotors by means of a double-sided connection. 
   
   
     22. Electronic dobby device according to  claim 1 , wherein the rotors ( 1 , 2 ) are installed next to each other on their respective rotor shafts ( 5 , 6 ) at a pitch which is equal to the pitch at which the weaving frames are installed in the weaving machine one after the other. 
   
   
     23. Electronic dobby device according to  claim 1 , wherein the rotors ( 1 , 2 ) have a thickness substantially corresponding to the thickness of a weaving frame. 
   
   
     24. Weaving machine provided with an electronic dobby device according to  claim 1 .